Expansion arbor



A. c. VAN sLuYs EXPANSION ARBOR led April 23,192 5 EEEEEE fldogmav sb mga Patented Dec. 2, 1924.

UNITED s'ra rs 4 1,518,026 PATENT orFice.

ADOLPH C. VAN SLUYS. OF NASHUA, NEW HAMRiiIRE, ASSIGNOR T0 NiASHUA.

GUMMED & COATED PAPER COMPANY, OF NASHUA, NEW HAMIPSHIRE, A CORPORA-'I'ION OF MASSACHUSETTS.

EXPANSION ARBOR.

Application tiled April 23, 1924. Serial No. 708,589.

To all whom, it may concern:

Be it known that I, Anoorn C. VA'N Snow, a citizen of the United States,and resident of Nashua, in the county of Hillsboro and State of NewHampshire, have invented certain new and useful Improvements in Expansion Arbors, of which the following is as gummed or coated paper orcloth, on-

cores of pasteboard.

The object of my invention is to provide a" rotary arbor having anexpansion member for frietionally engaging a core removably mountedthereon and having means whereby changes may be readily and quickly madeto enable the arbor to be employed for rotating any one of a number ofcores which widely vary in diameter.

To this end, my invention consists in the construction and combinationof parts substantially as hereinafter described and claimed.

Of the accompanying drawings Figure 1 is a sectional side elevation of acomplete expansion arbor embodying my invention.

Figures 2, 3, 4 and 5 are perspective views of different members of thearbor.

Figure 6 is an under plan view of the compression nut or knob.

Similar reference characters indicate similar parts in all of the views.

A shaft 11 having an externally threaded stem 12 is, in practice,mounted in a suitable bearing not necessary to illustrate, and isrotated by any suitable means as by a belt mounted on a pulley of theshaft. Said shaft is illustrated as having an external groove for oilfor lubricating purposes. As illustrated by Figure 1, the shaft isvertical and its upper portion (including the stem '12) extends throughan opening in a table or platform a portion of which is indicated at T.It is to be understood however that I do not limit myself to use of thedevice in such position. For some purposes the shaft might be mounted torotate on a hori zontal axis. v

Removably engaging the threaded upper end of the shaft stem 12 is aninternally threaded nut or knob 13, said knob bearing on a disk or plate14, the latter having a splined connection with the 'stem 12 so that itmust rotate with but can be adjusted longitudinally of the said stem.

The disk or plate 14 bears on an expansion member 15 which is preferablya cylindrical block of rubber having a central bore fitting the stem 12,and the said member 15 is supported by a disk or plate 16 looselymounted on the stem 12 and having pins lfi'removably engaging holes 17in a collar 17 which is integral with or rig= idly connected with theshaft'll. As shown by Figure 1, the member 15 is supposed to be undersome compression between the disks 14, 16, and therefore somewhatexpanded radially so as to frictionally engage the interior of the core.a shown as mounted thereon.

In practice, one end of, a strip of the material to be wound on the corea is attached to said core adhesively or otherwise, and then the shaftis driven to wind the strip on the core. Upon starting any winding on a.

new core, the parts are operated to first:

permit the expansion member to contract, and such new core is droppedover it to position with its lower edge'bearing on the table. T. Thenthe nut 13 is turned to cause the disk 14 to bear on the member withpressure enough to effect expansion of the member 15 into frictionalcontact with'the core, after which the winding can be started.

Upon completion of the winding, turning of the nut 13 in the reversedirection will permit the member 15 to contract so that the core and thecoiled strip thereon can be removed. The nut 13 is of lesser diameterthan the member 15 and the core a so that said core can always beremoved or put in place without requiring removal of any parts of thedevice itself. A slight turning of the nut 13 in one direction or theother is .all that is required.

An important feature of my invention consists in the disk or plate 16which is lid ' this reason it is desirable to use disks of the nut 13 isremoved and the disks 1d and 16 and the member 15 are slipped off. Thena disk 16 of larger diameter but having pins 16' so located as to fitthe holes of the collar 17 is mounted in place, a member 15 of requiredlarger diameter is fitted to place, and preferably a disk'l l of largerdiameter is slipped onto the stem 12, andthe nut 13 then replaced.

l he reason for using a disk 16 of larger diameter and preferably alsothe upper disk 14, is that a better engagement of the member 15 with thecore is eflected when the disks are of nearly the diameter of the member15 than if said disks were considerably smaller. If the disk 16 is muchsmaller than the member 15, the latter, when of rubber and undercompression, would squeeze down somewhat around the edges of the disk.In other words, a rubber block such as illustrated, when longitudinallycompressed between two disks and consequently radially expanded,presents a more uniform cylindrical surface when the three are of nearlythe same diameter than when the disks are much smaller than the block.For

difi'erent sizes as well as expansion members of difierent sizes fordifferent diameters of cores on which the strips are to be wound.

When the device is used as illustrated by 1F igure 1, it is importantthat the top of the collar 17 of the shaft shall be substantially flushwith the top of the table T not only to enable the disk 16 to extendmore or less out beyond the margin of the hole in the table regardlessof the diameter of said disk, but also to enable the top of the table tofurnish the stop for arresting the core a, in proper position when saidcore is dropped to place for starting a winding operation.

ll do not limitmyself to the employment 7 of a single expansion member15. If the core a on which the sheet material is to be wound is a longone, there may be a plurality of disks llalternating with a plurality ofexpansion members 15. In such case, all of the disks will be positivelyconnected with the shaft so as to be rotated by the shaft withouteffecting any torsional strain on the expansion member or members. llnthe structure as illustrated, the disk 14: is positively driven by theshaft, owing to the splined connection therewith, and the disk 16 ispositively driven by the shaft owing to rtiaoae the pin connection withthe holes of the shaft collar 17.

Having new claim 1. A rotatable shaft having means for re; movablyconnecting a disk therewith, second disk movable longitudinally of theshaft and having splined connection therewith, an elastic member on theshalt between the two disks, and means for actuating said second disk tolongitudinally compress and radially expand said elastic member to causeit to fi'ictionally engage the interior of a core.

2. A device of the character described, comprising a shaft having twodisks condescribed my invention, ll

'nected to rotate therewith, one of said disks disk, and an elasticblock confined between the two disks and adapted to be expanded tofrictionally engage the interior of a core, said nut being of lesserdiameter than the said elastic block and adjustable disk.

4:. A device of the character described, comprising a shaft having acollar provided With holes, a disk mounted on the shaft and having pinsengaging the holes of said collar, an elastic block bearing at one endagainst said disk. and adapted to be expanded to frictionally engage theinterior of a core, and an adjustable disk bearing against the other endof said block.

5. The combination with a horizontal support having a hole, a verticalshaft extending through said hole and having its portion above saidsupport provided with an elastic block and means for expanding saidblock, said block having a diameter exceeding the diameter of the holein the support whereby an arbor dropped over the elastic block may bearrested in position iior operation by the top of said support aroundits hole.

In testimony whereof l have atlixed my signature.

ADQLPH 0. van SLUYS.

